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Proof Testing

Web Slings

Proof Testing of Sling Exposed to Ultra Violet Light

Slings used in environments where they are subject to continuous exposure to ultra violet light (sunlight) should be proof tested to two (2) times rated capacity semi-annually, or more frequently, depending on severity of exposure.
Testing has confirmed that Nylon Slings lose fifty (50) to sixty (60) percent of their strength after 36 months of continuous exposure to sunlight. Polyester loses about thirty (30) percent over the same period. Contact CERTEX for further information on the Testing program completed by the Web Sling and Tie Down Association.

Operating Practices

1. Determine weight of the load. The weight of the load shall be within the rated capacity of the Sling.
2. Select Sling having suitable characteristics for the type of load, hitch and environment.
3. Slings shall not be loaded in excess of the rated capacity. Consideration shall be given to the Sling to load angle which affects rated capacity. (See Sling Angle Chart)
4. Slings with fittings which are used in a choker hitch shall be of sufficient length to assure that the
choking action is on the webbing and never on a fitting or splice.
5. Slings used in a basket hitch shall have the load controlled to prevent slippage.
6. The opening in fittings shall be the proper shape and size to insure that the fitting will seat properly in the hook or other attachments.
7. Slings shall always be protected from being cut by corners, edges, protrusions or abrasive surfaces with protection sufficient for the intended purpose
8. Slings shall not be dragged on the floor or over abrasive surface.
9. Slings shall not be twisted or tied into knots, or shortened or joined by knotting.
10. . Slings shall not be pulled from under loads if the load is resting on the Sling. Loads resting on Web slings could damage the Sling.
11. Do not drop Slings equipped with metal fittings.
12. Slings that appear to be damaged shall not be used unless inspected and accepted.
13. The Sling shall be hitched in a manner providing control of the load.
14. Personnel shall stand clear of the suspended load.
15. Personnel, including portions of the human body, shall be kept from between the Sling and the load, and from between the Sling and the crane hook or hoist hook.
16. Personnel shall not ride the Sling or load being lifted.
17. Shock loading shall be avoided.
18. Twisting and kinking the legs (branches) shall be avoided.
19. Load applied to the hook shall be centered in the base (bowl) of hook to prevent point loading onthe hook.
20. During lifting, with or without the load, personnel shall be alert for possible snagging.
21. The Web Slings’ legs (branches) shall contain or support the load from the sides above the centerof gravity when using a basket hitch
22. Slings shall be long enough so that the rated capacity of the Sling is adequate when the angle of the legs (branches) is taken into consideration. (See Load Chart)
23. Place blocks under load prior to setting down the load, to allow removal of the Web Sling, if applicable
24. Nylon & Polyester Slings shall not be used in contact with objects or at temperatures above194 degrees F (90 degrees C).
25. Exposure to sunlight or ultra-violet light degrades the strength of Slings. Store Slings in a cool, dry and dark place when not in use.
26. Slings shall not be used to pull on objects in a snagged or constrained condition.
27. Only Web Slings with legible identification tags shall be used.
28. Tags and labels should be kept away from the load, hook and point of choke.
29. Web Slings shall not be constricted or bunched between the ears of a clevis or shackle.
30. Web Slings shall not be used as bridles on suspended personnel platforms.